Fluid-driven turbine



Feb. 5, 1929.

y 1,701,029 J. A. CHOQUETTE FLUID DRIVEN TURBJVNE oiled July 5, 1927 mwmmdm T-w mgmlm w M m.) CWM T RIM E B N Patented Feb. 5, 1929.

UNITED STATES PATENT OFFICE.

JOHN ALBERT CHOQUETTE, 0F OTTAWA, GNTARIO, CANADA.

FLUID-DRIVEN TURINE.

Application led July 5,

This invention relates to turbines of the kind comprising a cylindricalcasing having diametrically opposed inlet` ports through which fluidunder pressure is projected tangentially onto the vanes of a rotormounted in said casing A turbine of this kind is described in applicantsco-pending application No. 748,404, November 7, 1924, patented March 6,1928, No. 1,661,716.

The object of the invention is to provide certain improvements inturbines of this kind whereby their construction is simplified and theirefficiency increased.

The present invention consists in a turbine of the kind describedwherein diametrically opposed fluid discharge ports are provided closelyadjacent the fluid inlet ports and wherein an inwardly extendingprojection is provided on the casing between each adjacent pair of inletand discharge ports, said projections being in substantially fluid-tightcontact with or proximity to the rotor and shaped on one side to directfluid from the inlet ports tangentially onto the vanes of the rotor andon the other side to direct fluid from the vanes into the dischargeports, the outer ends of substantially all the vanes being spaced auniform distance from the interior surface of the casing except thosewhich contact with said projection, characterized by the provision ofvanes on the end walls of the rotor in addition to vanes on theperiphery thereof.

Referring now to the accompanying drawings which illustrate by way ofexample one convenient embodiment of the invention,

Figure 1 is a central, vertical sectional elevation,

Figure 2 is a section on line 2 2 of Figure 1,

Figure 3 is a side elevation and Figure 4 is a section on line 4-4 ofFigure 1.

The casing comprises a hollow cylindrical portion 1 closed by end walls2 and 3, and at the centre of the casing is a shaft 4 to which a rotordrum 5 is rigidly secured, for example, by means of keys 6. The rotordrum 5 carries on its periphery a series of relatively narrow andclosely spaced vanes or blades 7 and a series of similar vanes 8 iscarried by each of the end Walls of the drum 5.

The outer edges of the vanes 7 and 8 are spaced from the casing asubstantial distance throughout the major portion of the circumferenceof the casing, but at the top and bot- 1922. Serial No. 203,594.

tom of the casing this space is divided into two parts by means ofdiametrically arranged projections or bailles 9. The baliles 9 areshaped on their inner surfaces so asto fit in fluid tight contact withthe outer edges of the vanes 7 and 9 with a minimum of friction.Adjacent one side of each baffle the casing is provided with a fluidinlet opening 10 and adjacent the opposite side of eachv baille isprovided a fluid outlet 11.

Diametrically opposed velocity increasing elements or deflectors 12 arearranged in the spaces through which fluid passes from the inlets 10 tothe outlets 11. Similar radially disposed deflectors 13, which areconnected by the deilectcrs 12, extend down in proximity to the sidevanes 8 and are carried by discs or bosses 14, one of which may berotatably mounted on a bushing 15 keyed to the casing at 16, while theother may be provided with a central boss 17 keyed at 18 to a bushing19.

Means are provided for adjusting the position of the deflectors whendesired and these means may conveniently take the form of a worm 2Omeshing with a worin-wheel 21 keyed at 22 to the boss 17 of thedellector structure 12-13-14.

The side vanes 8 arev substantially radial and are preferably arrangedto forni side continuation of the peripheral vanes 7. The vanes 8 may bemade integral with the vanes 7, but are preferably made separately andwelded or otherwise connected to the ends of the vanes 7 as indicated at23, Figure 2,

The construction and operation is similar to that of the turbine.described in applicants British Patent No. 241,907 and Canadian PatentNo. 263,287, excepting for the provision'of the side vanes 8 which addconsiderably to the eliiciency of the device.

Liquid under a pressure created by a head or a pump is introduced intothe inlets 10 and flows slowly at a high pressure through the spacesbetween the inlets 10 and the deflectors 12-13, and from the deflectorsto the outlets 11 the fluid flows at a high velocity, thus causing arapid rotation of the rotor. The shaft 4 of the rotor is connected toany suitable pulleys or transmission gearing', not shown.

The form of the invention above described is given by way of exampleonly, and may be modified within the scope 0f the appended claimswithout departing from the invention.

What I claim is:

1. A turbine comprising a cylindrical casing having dia-inetricallyopposed uid inlet ports7 a rotor mounted concentrically in said casing,a series of vanes on the periphery of said rotor, a series of vanes oneach of the end Walls of the 1otor,dia1netrica11y opposed Huid dischargeports closely adjacent said Huid inlet ports7 an inwardly extendingprojection on the casing between each adjacent pair of inlet anddischarge ports, said projections being in substantially fluid-tightcontact with or proximity to the rotor and shaped on one side to directHuid from the inlet ports tangentialiy onto the vanes of the rotor andon the other side to direct fluid from the vanes JOHN ALBERT CHOQUETTE.

